Sahih Bukhari
Beginning of Creation
Volume: 004 / Book Number: 054 / Hadith Number: 423
Narrated 'Abdullah bin 'Umar:
The Prophet said, "The sun and the moon do not eclipse because of someone's death or wife (i.e. birth), but they are two signs amongst the Signs of Allah. So, if you see them (i.e. eclipse) offer the Prayer (of eclipse)."